<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>外边距</title>
    <style>
        #d1 {
            width: 100px;
            height: 100px;
            border: 1px solid red;
            /*单独某个方向添加外边距*/
            margin-left: 100px;
            margin-top: 100px;
            /*四个方向添加外边距*/
            margin: 50px;
            /*上下和左右都添加外边距*/
            margin: 100px 50px;
            /*上右下左  顺时针赋值*/
            margin: 10px 20px 30px 40px;
        }

        #d2 {
            width: 100px;
            height: 100px;
            border: 1px solid red;
            /*上下相邻两个元素彼此添加外边距，取最大值*/
            margin-top: 50px;
        }

        #s1 {
            /*行内元素上下外边距 无效*/
            margin-right: 50px;
        }

        #s2 {
            /*左右相邻彼此添加外边距  两者相加*/
            margin-left: 30px;
        }
        #big{
            width: 200px;
            height: 200px;
            background-color: blue;
            /*解决粘连问题*/
            overflow: hidden;
        }
        #big>div{
            width: 50px;
            height: 50px;
            background-color: green;
            margin-left: 50px;
            margin-top: 50px;
        }
    </style>
</head>
<body>
<div id="big">
    <div></div>
</div>
<span id="s1">span1</span>
<span id="s2">span2</span>

<div id="d1"></div>
<div id="d2"></div>
</body>
</html>